INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-android-49-kasan-gce-4,10.128.15.192' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 27.114375] [ 27.114683] ===================================== [ 27.115343] [ BUG: bad unlock balance detected! ] [ 27.115984] 4.9.67-gf26d3c7 #106 Not tainted [ 27.116568] ------------------------------------- [ 27.117230] syzkaller560606/3281 is trying to release lock (mrt_lock) at: [ 27.118214] [] ipmr_mfc_seq_stop+0xe4/0x140 [ 27.118984] but there are no more locks to release! [ 27.119645] [ 27.119645] other info that might help us debug this: [ 27.120559] 1 lock held by syzkaller560606/3281: [ 27.121186] #0: (&p->lock){+.+.+.}, at: [] seq_read+0xdd/0x1290 [ 27.122368] [ 27.122368] stack backtrace: [ 27.122966] CPU: 0 PID: 3281 Comm: syzkaller560606 Not tainted 4.9.67-gf26d3c7 #106 [ 27.124009] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.125227] ffff8801cae87918 ffffffff81d906e9 ffffffff849ae8f8 ffff8801ca5b8000 [ 27.126350] ffffffff834dec54 ffffffff849ae8f8 ffff8801ca5b8888 ffff8801cae87948 [ 27.127474] ffffffff812353f4 dffffc0000000000 ffffffff849ae8f8 00000000ffffffff [ 27.128600] Call Trace: [ 27.128953] [] dump_stack+0xc1/0x128 [ 27.129684] [] ? ipmr_mfc_seq_stop+0xe4/0x140 [ 27.130493] [] print_unlock_imbalance_bug+0x174/0x1a0 [ 27.131389] [] lock_release+0x6f8/0xb80 [ 27.132130] [] ? memcpy+0x45/0x50 [ 27.132805] [] ? ipmr_mfc_seq_stop+0xe4/0x140 [ 27.133617] [] _raw_read_unlock+0x1a/0x50 [ 27.134380] [] ipmr_mfc_seq_stop+0xe4/0x140 [ 27.135178] [] traverse+0x3a7/0x900 [ 27.140420] [] ? seq_buf_alloc+0x80/0x80 [ 27.146095] [] seq_read+0x7ea/0x1290 [ 27.151425] [] ? __lock_acquire+0x629/0x3640 [ 27.157446] [] ? seq_escape+0x200/0x200 [ 27.163035] [] ? seq_escape+0x200/0x200 [ 27.168626] [] proc_reg_read+0xef/0x170 [ 27.174213] [] ? proc_reg_write+0x170/0x170 [ 27.180146] [] __vfs_read+0x103/0x670 [ 27.185559] [] ? default_llseek+0x290/0x290 [ 27.191498] [] ? fsnotify+0x86/0xf30 [ 27.196825] [] ? fsnotify+0xf30/0xf30 [ 27.202242] [] ? avc_policy_seqno+0x9/0x20 [ 27.208091] [] ? selinux_file_permission+0x82/0x460 [ 27.214723] [] ? security_file_permission+0x89/0x1e0 [ 27.221436] [] ? rw_verify_area+0xe5/0x2b0 [ 27.227331] [] vfs_read+0x11e/0x380 [ 27.232615] [] SyS_pread64+0x13f/0x170 [ 27.238119] [] ? SyS_write+0x1b0/0x1b0 [ 27.243628] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.250438] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.256984] [] entry_SYSCALL_64_fastpath+0x23/0xc6 executing program